Combinatorial Atmospheric Pressure Chemical Vapor Deposition of Graded TiO2鈥揤O2 Mixed-Phase Composites and Their Dual Functional Property as Self-Cleaning and Photochromic Window
详细信息 查看全文
- 作者：Mia Wilkinson ; Andreas Kafizas ; Salem M. Bawaked ; Abdullah Y. Obaid ; Shaeel A. Al-Thabaiti ; Sulaiman N. Basahel ; Claire J. Carmalt ; Ivan P. Parkin
- 刊名：ACS Combinatorial Science
- 出版年：2013
- 出版时间：June 10, 2013
- 年：2013
- 卷：15
- 期：6
- 页码：309-319
- 全文大小：584K
- 年卷期：v.15,no.6(June 10, 2013)
- ISSN：2156-8944
文摘
A combinatorial film with a phase gradient from V:TiO2 (V: Ti 鈮?0.08), through a range of TiO2鈥揤O2 composites, to a vanadium-rich composite (V: Ti = 1.81) was grown by combinatorial atmospheric pressure chemical vapor deposition (cAPCVD). The film was grown from the reaction of TiCl4, VCl4, ethyl acetate (EtAc), and H2O at 550 掳C on glass. The gradient in gas mixtures across the reactor induced compositional film growth, producing a single film with numerous phases and compositions at different positions. Seventeen unique positions distributed evenly along a central horizontal strip were investigated. The physical properties were characterized by wavelength dispersive X-ray (WDX) analysis, X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and UV鈥搗isible spectroscopy. The functional properties examined included the degree of photoinduced hydrophilicity (PIH), UVC-photocatalysis, and thermochromism. Superhydrophilic contact angles could be achieved at all positions, even within a highly VO2-rich composite (V: Ti = 1.81). A maximum level of UVC photocatalysis was observed at a position bordering the solubility limit of V:TiO2 (V: Ti 鈮?0.21) and fragmentation into a mixed-phase composite. Within the mixed-phase TiO2: VO2 composition region (V: Ti = 1.09 to 1.81) a decrease in the semiconductor-to-metal transition temperature of VO2 from 68 to 51 掳C was observed.